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Message-ID: <4cc9d274.ggqzOokWXNOGRay7%pugs@cisco.com>
Date: Thu, 28 Oct 2010 12:43:48 -0700
From: Tom Lyon <pugs@...co.com>
To: linux-pci@...r.kernel.org, jbarnes@...tuousgeek.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
randy.dunlap@...cle.com, arnd@...db.de, joro@...tes.org,
hjk@...utronix.de, avi@...hat.com, gregkh@...e.de,
chrisw@...s-sol.org, alex.williamson@...hat.com, mst@...hat.com
Subject: [PATCH 3/4] VFIO V5: uiommu driver - allow user progs to
manipulate iommu domains
Signed-off-by: Tom Lyon <pugs@...co.com>
---
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/vfio/Kconfig | 8 +++
drivers/vfio/Makefile | 1 +
drivers/vfio/uiommu.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/uiommu.h | 76 +++++++++++++++++++++++++++++
6 files changed, 214 insertions(+), 0 deletions(-)
create mode 100644 drivers/vfio/Kconfig
create mode 100644 drivers/vfio/Makefile
create mode 100644 drivers/vfio/uiommu.c
create mode 100644 include/linux/uiommu.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index a2b902f..711c1cb 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -111,4 +111,6 @@ source "drivers/xen/Kconfig"
source "drivers/staging/Kconfig"
source "drivers/platform/Kconfig"
+
+source "drivers/vfio/Kconfig"
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index a2aea53..c445440 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_FUSION) += message/
obj-y += firewire/
obj-y += ieee1394/
obj-$(CONFIG_UIO) += uio/
+obj-$(CONFIG_UIOMMU) += vfio/
obj-y += cdrom/
obj-y += auxdisplay/
obj-$(CONFIG_PCCARD) += pcmcia/
diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
new file mode 100644
index 0000000..3ab9af3
--- /dev/null
+++ b/drivers/vfio/Kconfig
@@ -0,0 +1,8 @@
+menuconfig UIOMMU
+ tristate "User level manipulation of IOMMU"
+ help
+ Device driver to allow user level programs to
+ manipulate IOMMU domains.
+
+ If you don't know what to do here, say N.
+
diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
new file mode 100644
index 0000000..556f3c1
--- /dev/null
+++ b/drivers/vfio/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_UIOMMU) += uiommu.o
diff --git a/drivers/vfio/uiommu.c b/drivers/vfio/uiommu.c
new file mode 100644
index 0000000..5c17c5a
--- /dev/null
+++ b/drivers/vfio/uiommu.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@...co.com
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+/*
+ * uiommu driver - issue fd handles for IOMMU domains
+ * so they may be passed to vfio (and others?)
+ */
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/iommu.h>
+#include <linux/uiommu.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tom Lyon <pugs@...co.com>");
+MODULE_DESCRIPTION("User IOMMU driver");
+
+static struct uiommu_domain *uiommu_domain_alloc(void)
+{
+ struct iommu_domain *domain;
+ struct uiommu_domain *udomain;
+
+ domain = iommu_domain_alloc();
+ if (!domain)
+ return NULL;
+ udomain = kzalloc(sizeof *udomain, GFP_KERNEL);
+ if (!udomain) {
+ iommu_domain_free(domain);
+ return NULL;
+ }
+ udomain->domain = domain;
+ atomic_inc(&udomain->refcnt);
+ return udomain;
+}
+
+static int uiommu_open(struct inode *inode, struct file *file)
+{
+ struct uiommu_domain *udomain;
+
+ udomain = uiommu_domain_alloc();
+ if (!udomain)
+ return -ENOMEM;
+ file->private_data = udomain;
+ return 0;
+}
+
+static int uiommu_release(struct inode *inode, struct file *file)
+{
+ struct uiommu_domain *udomain;
+
+ udomain = file->private_data;
+ uiommu_put(udomain);
+ return 0;
+}
+
+static const struct file_operations uiommu_fops = {
+ .owner = THIS_MODULE,
+ .open = uiommu_open,
+ .release = uiommu_release,
+};
+
+static struct miscdevice uiommu_dev = {
+ .name = "uiommu",
+ .minor = MISC_DYNAMIC_MINOR,
+ .fops = &uiommu_fops,
+};
+
+struct uiommu_domain *uiommu_fdget(int fd)
+{
+ struct file *file;
+ struct uiommu_domain *udomain;
+
+ file = fget(fd);
+ if (!file)
+ return ERR_PTR(-EBADF);
+ if (file->f_op != &uiommu_fops) {
+ fput(file);
+ return ERR_PTR(-EINVAL);
+ }
+ udomain = file->private_data;
+ atomic_inc(&udomain->refcnt);
+ return udomain;
+}
+EXPORT_SYMBOL_GPL(uiommu_fdget);
+
+void uiommu_put(struct uiommu_domain *udomain)
+{
+ if (atomic_dec_and_test(&udomain->refcnt)) {
+ iommu_domain_free(udomain->domain);
+ kfree(udomain);
+ }
+}
+EXPORT_SYMBOL_GPL(uiommu_put);
+
+static int __init uiommu_init(void)
+{
+ return misc_register(&uiommu_dev);
+}
+
+static void __exit uiommu_exit(void)
+{
+ misc_deregister(&uiommu_dev);
+}
+
+module_init(uiommu_init);
+module_exit(uiommu_exit);
diff --git a/include/linux/uiommu.h b/include/linux/uiommu.h
new file mode 100644
index 0000000..d307b71
--- /dev/null
+++ b/include/linux/uiommu.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@...co.com
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * uiommu driver - manipulation of iommu domains from user progs
+ */
+struct uiommu_domain {
+ struct iommu_domain *domain;
+ atomic_t refcnt;
+};
+
+/*
+ * Kernel routines invoked by fellow driver (vfio)
+ * after uiommu domain fd is passed in.
+ */
+struct uiommu_domain *uiommu_fdget(int fd);
+void uiommu_put(struct uiommu_domain *);
+
+/*
+ * These inlines are placeholders for future routines
+ * which may keep statistics, show info in sysfs, etc.
+ */
+static inline int uiommu_attach_device(struct uiommu_domain *udomain,
+ struct device *dev)
+{
+ return iommu_attach_device(udomain->domain, dev);
+}
+
+static inline void uiommu_detach_device(struct uiommu_domain *udomain,
+ struct device *dev)
+{
+ iommu_detach_device(udomain->domain, dev);
+}
+
+static inline int uiommu_map(struct uiommu_domain *udomain,
+ unsigned long iova,
+ phys_addr_t paddr,
+ int gfp_order,
+ int prot)
+{
+ return iommu_map(udomain->domain, iova, paddr, gfp_order, prot);
+}
+
+static inline void uiommu_unmap(struct uiommu_domain *udomain,
+ unsigned long iova,
+ int gfp_order)
+{
+ iommu_unmap(udomain->domain, iova, gfp_order);
+}
+
+static inline phys_addr_t uiommu_iova_to_phys(struct uiommu_domain *udomain,
+ unsigned long iova)
+{
+ return iommu_iova_to_phys(udomain->domain, iova);
+}
+
+static inline int uiommu_domain_has_cap(struct uiommu_domain *udomain,
+ unsigned long cap)
+{
+ return iommu_domain_has_cap(udomain->domain, cap);
+}
--
1.6.0.2
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